I hear Tesla no longer stock the 3 phase adapter, and I can't find one for less than £500.
This: Tesla 16A 3-phase Red Gen1 UMC adaptor - Xavelec
I've just bought a used Model S and don't have a charger at home yet, the one at work is a 5-pin, 3 phase port, here's a photo: (I only have the...